package main

import (
	"bytes"
	"flag"
	"io"
	"net/http"
	"sync"

	quic "github.com/lucas-clemente/quic-go"
	"github.com/lucas-clemente/quic-go/h2quic"
	"github.com/lucas-clemente/quic-go/internal/protocol"
	"github.com/lucas-clemente/quic-go/internal/utils"
	"io/ioutil"
	"time"
	"log"
	"os"
	"runtime/pprof"
)

func main() {
	verbose := flag.Bool("v", false, "verbose")
	filename := flag.String("f", "", "name of the file where to write the received data")
	cpuprofile := flag.String("cpuprofile", "", "write cpu profile `file`")
	tls := flag.Bool("tls", false, "activate support for IETF QUIC (work in progress)")
	flag.Parse()
	if *cpuprofile != "" {
		f, err := os.Create(*cpuprofile)
		if err != nil {
			log.Fatal("could not create CPU profile: ", err)
		}
		if err := pprof.StartCPUProfile(f); err != nil {
			log.Fatal("could not start CPU profile: ", err)
		}
		defer pprof.StopCPUProfile()
	}
	urls := flag.Args()

	if *verbose {
		utils.SetLogLevel(utils.LogLevelDebug)
	} else {
		utils.SetLogLevel(utils.LogLevelInfo)
	}
	utils.SetLogTimeFormat("")

	versions := protocol.SupportedVersions
	if *tls {
		versions = append([]protocol.VersionNumber{protocol.VersionTLS}, versions...)
	}

	roundTripper := &h2quic.RoundTripper{
		QuicConfig: &quic.Config{Versions: versions},
	}
	defer roundTripper.Close()
	hclient := &http.Client{
		Transport: roundTripper,
	}
	// added by michelfra: compute time elapsed
	start := time.Now()
	var wg sync.WaitGroup
	wg.Add(len(urls))
	for _, addr := range urls {
		utils.Infof("GET %s", addr)
		go func(addr string) {
			rsp, err := hclient.Get(addr)
			if err != nil {
				panic(err)
			}
			utils.Infof("Got response for %s: %#v", addr, rsp)

			body := &bytes.Buffer{}
			//_, err = io.Copy(body, rsp.Body)
			_, err = io.Copy(os.Stdout, rsp.Body)
			if err != nil {
				panic(err)
			}
			utils.Infof("Request Body:")
			if *filename != "" {
				utils.Infof("Written content in file %s", *filename)//%s", body.Bytes())
				ioutil.WriteFile(*filename, body.Bytes(), 0644)
			} else {
				utils.Infof("%s", body.Bytes())
			}
			wg.Done()
		}(addr)
	}
	wg.Wait()
	log.Printf("the GET took %s", time.Since(start))
}
